Wells



(No Model.)

- W. E. WELLS. DENTAL MALLET.

. Panpened Nov. 5, 1889.

6M? am N. PEYERS. FhcwLithngmpher. washngwn, n.6;

UNITED STATES PATENT EEICE.

lVlliLlAM E. VELLS, OF NEV YORK, lN. Y.

DENTAL MALLET. Y

SPECIFICATION forming part of Letters Patent No. 414,353, dated November 5, 1889. Application filed June 10, 1889- Serial No. 313,810. (No model.)

' cation.

My invention relates to that class of dental mallets which is operated from a suitable motor to strike a percussive blow, and especially to that class which is actuated from the ordinary dental engine, its object being to provide a mallet of this class which shall not only be simple and cheap in construction, but which shall at the same time be effective in operation and permit of the blow being delivered upon the point or head supporting bar or rod either in a direction toward said point or head or away from the same, as desired.

To this end my invention consists, iirst, in

the peculiarities of construction of the hammer and its combination with the point or head supporting rod or bar and the means whereby it is operated; second, in the means for adjusting the hammer to increase or decrease the force of the blow and permit of its being delivered either in one directioiror in the other, as desired, and, third, in various other combinations and arrangements of parts, all as will hereinafter more fully appear.

Referring to the accompanying drawings, which form a part of this specification, Figure 1 is a longitudinal sectional elevation of my invention, taken in a plane passing axially through the point or head supporting bar, the parts being in the position they will occupy when arranged for the hammer to deliver its blow in a direction toward the point or head 5 Fig. 2, a similar section of the same-parts, taken in the same plane, the adjustment being such as to permit of the hammer delivering its blow in the opposite direction or away from said point or head; and Fig. 3, a side elevation of the housings, looking toward the left in Figs. 1 and 2.

In all the figures like letters are employed to designate corresponding parts.-

'Ihe housing or stock in which the various working parts of the mallet are arranged is or may be of any ordinary or preferred construction. As shown in the drawings, however, it consists of a body A, of rectangular form in both longitudinal and transverse sections, and provided with sleeve-like portions a Zi, projecting from its upper and under sides, respectively. These sleeve-like p0rtions may be made integral with the body A or separate therefrom, as desired. l prefer, however, to make them in separate parts and to secure them in place by means of threaded Shanks CL Z7', which enter correspondinglyshaped orices in the body A, as shown, the axis of the portion a being preferably coincident with and in prolongation of the axis of the portion l).

B indicates the rod or bar, in or to ,the lower end of which is secured in any of the ordinary ways the point or head that is desired to be used. This rod or bar lis provided with suitable collars c c c2, and is iitted to slide in a socket C, which in turn is secured to the lower end of the sleeve-like portion h by means of a screw-thread or other preferred equivalent means.

D indicates the hammer, by means of which the blow is struck and the point or head operated. As shown in the drawings, it surrounds the rod or bar B between the collars c c', against one or the other of which it delivers its blow, as required, and is mounted upon the outer end of a spring-arm E, the inner end of which is secured to a block F. l prefer to make the upper and under surfaces of this hammer adjacent to the orifice d, through which the rod B passes, slightly convex, in order that the blow delivered upon either the upper or under collar may strike it square, and thereby prevent any jamming or binding of the rod in its socket C. To raise and depress this hammer against the stress of the spring-arm E, to cause the former to deliver its blow against either the collar c or the collar c', as the case may be, I employ the spiral cam H, which is mounted on the inner end of the shaft I and engages with an overhanging lip d', formed on or secured to the hammer in proper relation thereto. This cam will be made of the proper pitch tov insure the necessary movement of the hammer, and its spiral portion or thread will prefer ably terminate abruptly at its ends, as shown IOO in the drawings, whereby, when such cam has moved the hammer to the required extent, its operative surface will pass from contact with the lip or other part of the hammer with which it engages and the spring-arm will be free to carry the hammer forward with it, and thereby cause it to communicate a percussive blow to the point or head supporting bar. Vhen the hammer is to deliver its blow toward the point or head that is being employed, the spiral cam will engage with the under side of the overhanging lip, as shown in Fig. 1, the shaft I being rotated in the direction of the arrow fr, (shown in said figure but when it is to deliver its blow in the opposite direction such spiral cam will engage the upper side of the overhanging lip and the rotation of the shaft will be reversed, as shown by the arrow y in Fig. 2. In order to provide for the engagement of this spiral cam with either the upper or under side of the projecting lip d', as it may be desired to strike the blow against one or the other of the collars c c', as well as to regulate the force of the blow when delivered, the block F, to which the spring-arm Eis secured, instead of being fixedly attached to the body A of the housing, is adjustably secured thereto by means of a slot h and screws and set-nut 't' fi', an adj Listing-screw j being employed, if desired.

The point or head supporting rod or bar B having been acted upon bythe hammer D in one or the other direction, its return to its normal position is effected by means of the springs k l, which, pressing against opposite sides of the collar c2, return the rod or bar to the same position, ready for the next blow, no mattei' in which direction it may have been moved.

As thus constructed the operation is as follows: The parts being in the position shown in Fig. 1 and the shaft I rotated from either the dental engine or other convenient motor in the direction of the arrow x, the spiral cani will engage the under side of the overhanging lip on the hammer, raise it against the force of the spring until the upper end of` the cam passes from under said lip, when the hammer, by reason of the resiliency of the spring-arm upon which it is supported, will be forced violently downward and caused to strike the collar c', thereby driving the point or head supporting bar or rod forward with it, when the overhanging lip on the hammer will be again engaged by the spiral cam and the operation before mentioned repeated. Similarly, when the parts are in the position shown in Fig. 2 and the shaft .I is rotated in the direction of arrow y, the spiral cam will engage the upper side of the overhanging lip and force it downward until the lower end of such cam passes beyond the lip, when the resiliency of the spring-arm will quickly raise the hammer, causing its upper surface to strike the under side of the collar c and the point'or head supporting rod or bar to vbe carried forward with it in that direction.- I am thus enabled by simply raising' and lowering the block to which the spring-arm is attached and by rotating the shaft in one or the other direction to deliver the blow of the hammer first against one collar and then against the other, as desired.

In the foregoing I have described the best means contemplated by me for carrying my invention into practice; but I wish it distinctly understood that I do notlimit myself strictly thereto, as it is obvious that I may modify the details thereof in many waysv without departing from the spirit thereof.

Having thus described-my invention and one wayin which it is or may be carried into effect, what I claim as new, and desire to secure by Letters Patent of the United States, 1s-

l. rlhe combination, with the point or head supporting bar or rod provided with collars c c and a hammer surrounding such bar or rod between said collars, of a spring-arm, a block vto which said spring-arm is secured, and means whereby it may be-adj usted, substantially as described.

2. The combination, with the housing or stock, a point or head supporting bar or rod provided with collars c c c2 mounted thereon, a hammer surrounding this point or head supporting bar or rod and for co-operation with such collars, and a cam for operating` the hammer, of springs 7c Z, for operation with said point or head supporting bar or rod, substantially as described.

3. The combination, with the point or head supporting bar or rod provided with collars c c', the hammer D, and the cam for operating such hammer, of the spring-arm E, the block F, screw and set-nut ii', and the adjusting-screw j, as and for the purposes set forth. I

'4. The combination, with the point or head supporting bar or rod provided with the collars c c', and the hammer D, surrounding the same between such collars and provided with the convex surfaces and overhanging lip, of the spiral cam II and shaft I, as and for the purposes set forth.

5. The combination, with the housing or stock, the point or head supporting bar, the hammer for co-operating with the latter, the spring-arm for supporting said hammer, and means for varying the position of such arm7 of a cam for acting upon the hammer to move it against the action of its supporting-arm and means for rotating said cam, substantially as described.

In testimony whereof I have hereunto set my hand this 28th day of May, 1889.

VILLIAM E. VELLS.

Witnesses:

HENRY CARTER, WM. H. APPLETON.

IOO

IIO 

